Hydraulic back rest for grinding machines



July 12, 1932. A. P. STEINER ET AL 1,867,112

HYDRAULIC BACK REST FOR GRINDING MACHINES Filed 001;. 21, 1926 4 Sheets-Sheet 1 IN VEN TORS. L Amos P6212 n82:

BY ll/iroldiiBa/si ez' TORNEY.

July 12, 1932.

A. P. STEINER ET AL HYDRAULIC BACK BEST FOR GRINDING MACHINES 4 Sheets-Sheet 2 INVENTORSQ mos}? 65 M621 llaz'oldiiBauge 2::

Filed 001;. 21, 1926 it RNEY.

July 12, 1932. A. P. STEINER ET AL HYDRAULIC BACK REST FOR GRINDING MACHINES Filed Oct. 21 1926 4 SheetsShe'et 3 v R .mm mm. t N I P. m m

Patented July 12, 1932 U ITED STATES- Amos 1?. srnnvnfa AND HAROLD n. BALSIGER; F w YnEs ono; m se mss. 1 ,srenons T0 LANDIS TOOL COMPANY, or WAYNESBORO, ,PENNs LvAnInra: con

.arrangement of the piping; I

1 PORATION OF PENNSYLVANIA iri'nnAULic Bac BEST FOR eniiinrne Macmnns f Application liled October 1, 1925. serial no. 143,248. f

bracket 16. The work l8 is'supported in the I usual manner to be operated-upon by 'lill' f 'Our said invention relates to a combined back-rest and work support'for grinding machines and more particularly to crankshaft grinders and an object is toforce the-supporting blocks against the work hydraulically and also withdraw the blocks from the work hydraulically out ofJ-reach of the farthest throw of the crank-shaft, during the operation of indexing. Another object" is to provide means foroperatin'g the 'slideat such a reduced "rate that no vibration will be produced whensaid slide comes :up against the stops although' theslide is operated by fluid taken'from the high-pressure fiuid'lines which operate other mechanism of the grinding machine. Another object is 'toprovide simple means for reversing the movement of the slide Still furtherobjects are'to provide meansfor adjusting the j'aws as the work progresses and to also provide means for holding the'ja-ws firmly against the work during the grinding operation.

- Referringto the accompanying drawings which are made a part hereof and on which similar numerals designate like parts in the several views, I 1

- Figure 1 is a detail side elevation of our device showing" portions of the: grindingmachine, l i

Figure 2, a front elevation thereof, Figure 3, a detail horizontal section on the line 33'of Figure 2, j 'j 1' Figure L, afront elevation showing the Figure5 a side-elevation of thesame, Figure 6,a detail ofa smalLbore nipple used'in the pressure line,

' Figure '7 ,-a plan View of the slide, V yFigure 8, an end elevation of the jaw carried by the slidej and 1 p Figure '9, a side elevation thereof detached. Figure is a detail partly'in section show-- ing the rack and pinion drive for the work support slide, Figure 11 is a detail viewpartly in section ofthe fluid-"pressure cylinder-for actuating the work support. Inth drawings, the numeral 15 denotes the bed of the grindingmachine, 16 is a bracket bolted to said bed and 17 is the base .of the back-rest Which is secured'tosaid Wheel 19 shown in Figurel. The base 17 is ATENT)ewes1;:

provided on its'uppersurface with'slideways f L 20 adapted to receive a slideQl which carries on one end the-back-re'st j 22 adjustably mounted in slide 21.: Threaded into the'opposite endo'f the slide 21 is an adjustingscrew 23 having mounted thereon a'stop-dog24t adaptedto coact with a stop 25 The inner end 26 of this screw 23 is rounded off-and bears against the rear portion27 ofithejaw 22 to force-it against the work. The work'is v supported against downward movement by means of a 'jaw 28 mounted on a lever 29 piv- OliGfL between ears 3O formed on the-basal? and having a depending lug 31 which rests against the end of anadjusting 'screw "32 threaded into a slidable bushing 33in the base 17: The screw 32 carries a stop-dog'3'which c'oacts with a stop-35 accurately adjusting the jaw 28. The slide 2l with its associated parts and the bushing 33 withjthe screw 32 are moved in unison by means of a' bracket"36 bolted to the under side of'theslide 21 and,

secured to the end of thebushing83;The jaw 22 is removed from the work by means of the slide 21 through a spring- 37 having one end secured toa pin 38 0ntheslide'and its'opposite end secured to a pin 39onthe j aw thereby eliminating all jar to the parts, Both jaws are moved towards and awa'y from the work by hydraulic means as follows;

Bolted to the front'of the base 17 isa vertical cylinder 40 in which is a double acting pis ton 41 mounted on a vertical piston r'od42'. The cylinder 40' is provided with a' reversing slide valve 413 manually operated by means of a man; A oms leads to the taper the cylinderand a similar port .46 1e'ads tefthe bottom thereof as will'be hereinafter; more fully described. I The piston rod-42'has rack 47 formedon one 'sidefwhich'rack meshes with'a small pinion 4801i the shaft '49 ;-a"s'ee+' 0nd pinion 50 on the shaft 49'meshes witha horizontalzrack 51 secured" to the underside of the slide 21. The pinion48 is aboutha'lf the size of the pinion 50, sothat the's1ide'21 moves about twice as far; as thepist on; 41', which allows for a rapid opening'ofthe j am;

v As before stated, the jaw 22 is withdrawn by the slide 21 whereas the jaw 28 is withdrawn by gravity as the screw 32 is retracted through its connections with the slide 21.

Both jaws are bifurcated topermit the use of a gauging device, suchffor instance as an Arnold gauge. i v

The piston 41 'iso erated by fluid pressure supplied by a suitab Said fluid-passesalong apipe- 52, through a throttling nipple 53 toa valve 54:, thence through a pipe 55to a vertical port 56 in the cylinder casting tothe inlet chamber of the slide-valve vl3 to eitherQside ofthe piston at the will of the operator. The'exhaust passes [out throughla pipe'57 to the reservoir, (not shown). 1A branch pipe 58 :leads from the fluid pressure pipe 52 in advance .of the throttling nipple 53 and enters acylinder .59 whichcarries a .,control switch for the motor that operates-the. revolving heads, all shown and described ina co-pending application No.

7 126,583, filedAugust2, 1926. Thejthrottling nipple 53 consists of'a short length of pipe having a small bore therethroughwhich al' lows ,the required pressure of fluid to reach the cylinder 410 without reducing the .pressureto thevarious other devices which are 1' $6 supplied from the same source.

. {It will be obvious'to those skilled in-the art that ;-various I changes; may be made in our device without departing from thespirit' of ourinvention, and therefore we do :not wish to limit ourselves to what is shown-in the drawings; and described-in the specification, but only as indicated in theappended claims. Having thus fully described our said invention, what we claim as new and desire-to secure by Letters -Patent,is

' 1'. A hydraulic back -rest andsuppor tlfor cylindrical grinding machines comprising a base, a horizontal slide mounted on said base,

a jaw .pivotedto said base, a bushing slidable in said base, an adjusting-screw mounted in said bushing and coacting withsaid pivoted jaw, a bracket connecting said slide and bushing, a rack secured to the under side ofsaid slide, ,a horizontal shaft beneath said slide and at right angles thereto, a. large pinion on said shaft meshing with said rack, a'small pinion on the opposite end'of said shaft, a vertical pressure cylinder secured to said "setforth;

casting, and a piston rod in said cylinder hav 1 ing a rack on one-side tomesh withsai d small pinion to rotate said shaft, substantially as 2,. Acombined back-rest and support for grinding machinescompri sing abase, a hori zontalslide' mountedon said base, an "adjust ing screw mounted in said slide to limit the movement thereof, a horizontally disposed movabletbushing mounted in said base, an

adjusting screw insaid bushing for limiting the movement thereof, a bracketconnecting said slide with said bushing for simultaneous l e pump (not shown).- 'tially as set forth; f

movement thereof, a bifurcated bearing block I in said slide, a lever pivoted to said base. and

having a bearing block thereon, a depending 1 I I;

lug on said lever adapted to coact with said last mentioned. adjusting, screw, a fluid pressurelcylinder secured*to-saidbase, and rack an'd pinion connections from said cylinder to said slide to reciprocate the'same, substan- A hydraulic-backrest'and work support for a crank -grindingmahinecomprising a base, a back rest memberslidable horizontallyand transverselyof the work, a support movable vertically, horizontally movable "means mounted on said base for'actuating said jmovable members simultaneously and means to withdraw -.said :movable .means whereby work of; widely varying'diameters may be traversedtpastfthework rest, substantiallyas set forth. 7 r

'4. Ahydraulic back-rest and-support for crank grinders comprisinga base, -alongis tudinal slide mounted on said base, a backrest member mounted-in said slide, a bushing slidab'le in said ibase,.a vertical support memher mounted onsaid base, means carried by said'bu'shing for operating said vertical sup:

port member, abracket connecting said slide 7 and {said bushing: and 'means to actuate said slide and bushing'towardand away fromithe work, substantiallyras-set.forth; 1

5. A hydraul'c back-rest and worksu pip ort for agrinding'machine,comprisingabase, a

V movable back-rest member, a movable supportgmember, horizontally movable. means mountedon-said base for;actuatingsaid moviablemembers simultaneously, vertically. movable means mounted on baseto actuate said horizontally movable means, and means to move said horizontally movable. means through a distance greaterthan the radius of the largest path {described by the work piece, substantially as set forth.

6. In a grinding machine, a hydraulicback rest and-work support comprising a base, a horizontal:slidemounted on said base, aback rest member mounted in said slide,;afbushi'n'g slidably-mounted in the base, a work -support plvotally mounted on said base and movable vertically by saidlbushin'g, means 'for mov ngsaid slide and saidbushing simulsaid cylinder, operable connection between said piston and said slide and bushing, means for diverting a portion ofthe'joperative'fluid from the high pressure fluid line'of'the grinding machine to the said cylinder, and means for restricting; the flowof pressure fluid to said cylinder from said 'high pressure fluid line whereby operation of the back rest and work support will not materially aifectthe pressure in thehigh pressure fluid line of the grinding machine, substantially as setforth.

7. Ajhydraulic back restand worksupport fora machine of thekinddescribed compristaneously comprising a cylinder, a piston in 

